Altitude sudden jump

[axmiha]

I was flying from Bahia Blanca (SAZB) to Bariloche (SAZS) and cruising at FL320. Suddenly the plane went mad. Speed went to a billion knots, all alarms went nuts and the altitude jumped down to 9.000 feet. (INHG was still 2992) I went manual, reduced speed and started climbing again to FL320. It reached FL270 and stopped there, unable to climb more. The speed indicator showed the top speed needle (the red and white one) quite low (at about 220kts) so it looked like I was actually at the maximum altitude (FL370?). So something happened to the altimeter that it went crazy. Any ideas?

[Litjan]

Hmm - are you using real weather or a weather plugin?

 

[Morten]

XP Failures on?

[axmiha]

Hi. Real weather (match real world conditions on XP).

XP failures....er...er.....lemme check....all in "always working". A Fly with LUA problem perhaps?

 

Edited October 7, 2017 by axmiha

[axmiha]

Doesn't "smell" like an IXEG problem, and it's probably unrepeatable. Is there such a thing as, for instance, you pass through a certain area and something changes in XPlane info about altitude, terrain, position, weather, something? It felt like that. Something changed that made IXEG go mad, thinking i twas at 9000ft. But I'm just guessing...

[Litjan]

Yeah, really have no idea what could have caused a big jump like that. Variation in airspeed/altitude could be explained by:

• Sudden shift in environmental conditions (pressure, wind)
• Icing/malfunction of pitotstatic tubes

But this is the first report we got in that regard, so I can´t really say with certainty what happened. Let me know if you see it again, please!

Cheers, Jan

 

[axmiha]

Yes, sir.

ax